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206 lines
8.3 KiB
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DbEnv::set_lk_conflicts()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="lock.html" title="Chapter 7. The DbLock Handle" />
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<link rel="prev" href="envget_lk_tablesize.html" title="DbEnv::get_lk_tablesize()" />
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<body>
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<div xmlns="" class="navheader">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DbEnv::set_lk_conflicts()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="envget_lk_tablesize.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7.
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The DbLock Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envset_lk_detect.html">Next</a></td>
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</tr>
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</table>
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<hr />
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="envset_lk_conflicts"></a>DbEnv::set_lk_conflicts()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::set_lk_conflicts(u_int8_t *conflicts, int nmodes); </pre>
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<p>
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Set the locking conflicts matrix.
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</p>
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<p>
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If <code class="methodname">DbEnv::set_lk_conflicts()</code> is never called, a standard conflicts
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array is used; see <a href="../../programmer_reference/lock_stdmode.html" class="olink">Standard Lock Modes</a> for more information.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_lk_conflicts()</code> method configures a database
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environment, not only operations performed using the specified
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_lk_conflicts()</code> method may not be called after the
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<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is
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called. If the database environment already exists when
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<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> is called, the
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information specified to <code class="methodname">DbEnv::set_lk_conflicts()</code> will be ignored.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_lk_conflicts()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3631518"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3631507"></a>conflicts</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>conflicts</strong></span> parameter is the new
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locking conflicts matrix. The <span class="bold"><strong>conflicts</strong></span>
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parameter is an <span class="bold"><strong>nmodes</strong></span> by
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<span class="bold"><strong>nmodes</strong></span> array. A non-0 value for the array
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element indicates that requested_mode and held_mode conflict:
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</p>
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<pre class="programlisting"> conflicts[requested_mode][held_mode] </pre>
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<p>
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The <span class="emphasis"><em>not-granted</em></span> mode must be represented by 0.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3631097"></a>nmodes</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>nmodes</strong></span> parameter is the size of
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the lock conflicts matrix.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3631317"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::set_lk_conflicts()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3631570"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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If the method was called after <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a>
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was called; or if an invalid flag value or parameter was specified.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3631691"></a>ENOMEM</h4>
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</div>
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</div>
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</div>
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<p>
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The conflicts array could not be copied.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3631632"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>,
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<a class="link" href="lock.html" title="Chapter 7. The DbLock Handle">DbLock</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3631521"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="lock.html#locklist" title="Locking Subsystem and Related Methods">Locking Subsystem and Related Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="envget_lk_tablesize.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="lock.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envset_lk_detect.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DbEnv::get_lk_tablesize() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DbEnv::set_lk_detect()</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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